KMP_SGT1066
forum member
The other day I noticed the procharger was sounding different. It of course has the metal grinding noise-normal, but it is making like a howling type noise around 2-3000 rpms.. once in boost it has developed quite a whistle which wasn't there before. Bov still sounds normal. Anyway I took the air intake tubing off and noticed there was a little oil inside it. Checked the compressor oil and it was fine. Also a little residue around the drain bolt. This is my first experience with forced induction so I'm a little baffled